How Can I Handle File Downloads of Various Types in ASP.NET MVC using FileResult?

Downloading Diverse File Types in ASP.NET MVC using FileResult

ASP.NET MVC's FileResult offers a robust mechanism for managing file downloads, extending beyond its typical use with images. This article demonstrates how to leverage FileResult to download various file types from any directory.

The key is utilizing the generic octet-stream MIME type within your FileResult action:

<code class="language-csharp">public FileResult Download()
{
    byte[] fileBytes = System.IO.File.ReadAllBytes(@"c:\folder\myfile.ext");
    string fileName = "myfile.ext";
    return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, fileName);
}</code>

This approach ensures the file downloads with its original name, preventing filename mangling (e.g., adding underscores) in the "Save As" dialog. This flexible method supports downloading any file type from your designated directory.

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